New floor in stand up crawlspace - vapor barrier

I'm close to pouring a new floor in our stand up crawl space. Would it hurt to have *two* layers of vapor barrier below the concrete -- one on the dirt, then the gravel, and then another layer between the gravel and poured slab?

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Is this are going to be finished out when your done?
We use foam around here under the floors to insulate them before the pore.
I hope your not planning on poring this floor yourself unless you experianced at do this type work.
It's a one shot deal and no going back without tearing it out if it's done wrong.